I personally think no one should sing "Superstar" it's not a good sing to show off your voice, since they still have to do a short version of the songs, that chorus is long and boreing and the main singer has little to do in the chorus.
I can see David Cook (if he wants to do something from Superstar) doing Heaven on their minds or even the one Simon does (cant remember the title) I dont think any of them should atempt gesthemanie (sp)
as for Castro, I thought "Another Suitcase in Another Hall" would be great for him.
Sayesha (sp) should do memory
Carly should stick to "I dont know how to love him"
as for David A. It may sound crazy, but for a while now I thought a nice R&B sultry soul version of Music of the Night could work well (think of if Usher or someone like that were to redo it)
Either way I just hope the night does not flop like the last time they had a Broadway night.
I am sure Simon will have alot to say tonight (since basically none of the songs are popular in mainstream culture)
http://www.flickr.com/photos/27199361@N08/ Phantom at the Royal Empire Theatre